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<a name="boost.container.allocator"></a><div class="titlepage"></div>
<div class="refnamediv">
<h2><span class="refentrytitle">Class template allocator</span></h2>
<p>boost::container::allocator</p>
</div>
<h2 class="refsynopsisdiv-title">Synopsis</h2>
<div class="refsynopsisdiv"><pre class="synopsis"><span class="comment">// In header: &lt;<a class="link" href="../../boost_container_header_reference.html#header.boost.container.allocator_hpp" title="Header &lt;boost/container/allocator.hpp&gt;">boost/container/allocator.hpp</a>&gt;

</span><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> T<span class="special">,</span> <span class="keyword">unsigned</span> Version <span class="special">=</span> <span class="number">2</span><span class="special">,</span> 
         <span class="keyword">unsigned</span> <span class="keyword">int</span> AllocationDisableMask <span class="special">=</span> <span class="number">0</span><span class="special">&gt;</span> 
<span class="keyword">class</span> <a class="link" href="allocator.html" title="Class template allocator">allocator</a> <span class="special">{</span>
<span class="keyword">public</span><span class="special">:</span>
  <span class="comment">// types</span>
  <span class="keyword">typedef</span> <span class="identifier">T</span>                                                      <a name="boost.container.allocator.value_type"></a><span class="identifier">value_type</span><span class="special">;</span>     
  <span class="keyword">typedef</span> <span class="identifier">T</span> <span class="special">*</span>                                                    <a name="boost.container.allocator.pointer"></a><span class="identifier">pointer</span><span class="special">;</span>        
  <span class="keyword">typedef</span> <span class="keyword">const</span> <span class="identifier">T</span> <span class="special">*</span>                                              <a name="boost.container.allocator.const_pointer"></a><span class="identifier">const_pointer</span><span class="special">;</span>  
  <span class="keyword">typedef</span> <span class="identifier">T</span> <span class="special">&amp;</span>                                                    <a name="boost.container.allocator.reference"></a><span class="identifier">reference</span><span class="special">;</span>      
  <span class="keyword">typedef</span> <span class="keyword">const</span> <span class="identifier">T</span> <span class="special">&amp;</span>                                              <a name="boost.container.allocator.const_reference"></a><span class="identifier">const_reference</span><span class="special">;</span>
  <span class="keyword">typedef</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span>                                            <a name="boost.container.allocator.size_type"></a><span class="identifier">size_type</span><span class="special">;</span>      
  <span class="keyword">typedef</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">ptrdiff_t</span>                                         <a name="boost.container.allocator.difference_type"></a><span class="identifier">difference_type</span><span class="special">;</span>
  <span class="keyword">typedef</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">container</span><span class="special">::</span><span class="identifier">dtl</span><span class="special">::</span><span class="identifier">version_type</span><span class="special">&lt;</span> <span class="identifier">self_t</span><span class="special">,</span> <span class="identifier">Version</span> <span class="special">&gt;</span> <a name="boost.container.allocator.version"></a><span class="identifier">version</span><span class="special">;</span>        

  <span class="comment">// member classes/structs/unions</span>
  <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> T2<span class="special">&gt;</span> 
  <span class="keyword">struct</span> <a class="link" href="allocator/rebind.html" title="Struct template rebind">rebind</a> <span class="special">{</span>
    <span class="comment">// types</span>
    <span class="keyword">typedef</span> <a class="link" href="allocator.html" title="Class template allocator">allocator</a><span class="special">&lt;</span> <span class="identifier">T2</span><span class="special">,</span> <span class="identifier">Version</span><span class="special">,</span> <span class="identifier">AllocationDisableMask</span> <span class="special">&gt;</span> <a class="link" href="allocator/rebind.html#boost.container.allocator.rebind.other"><span class="identifier">other</span></a><span class="special">;</span>
  <span class="special">}</span><span class="special">;</span>

  <span class="comment">// <a class="link" href="allocator.html#boost.container.allocatorconstruct-copy-destruct">construct/copy/destruct</a></span>
  <a class="link" href="allocator.html#idm4777-bb"><span class="identifier">allocator</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span>
  <a class="link" href="allocator.html#idm4780-bb"><span class="identifier">allocator</span></a><span class="special">(</span><span class="keyword">const</span> <a class="link" href="allocator.html" title="Class template allocator">allocator</a> <span class="special">&amp;</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span>
  <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> T2<span class="special">&gt;</span> <a class="link" href="allocator.html#idm4786-bb"><span class="identifier">allocator</span></a><span class="special">(</span><span class="keyword">const</span> <a class="link" href="allocator.html" title="Class template allocator">allocator</a><span class="special">&lt;</span> <span class="identifier">T2</span> <span class="special">&gt;</span> <span class="special">&amp;</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span>

  <span class="comment">// <a class="link" href="allocator.html#idm4685-bb">public member functions</a></span>
  <span class="identifier">pointer</span> <a class="link" href="allocator.html#idm4686-bb"><span class="identifier">allocate</span></a><span class="special">(</span><span class="identifier">size_type</span><span class="special">,</span> <span class="keyword">const</span> <span class="keyword">void</span> <span class="special">*</span> <span class="special">=</span> <span class="number">0</span><span class="special">)</span><span class="special">;</span>
  <span class="keyword">void</span> <a class="link" href="allocator.html#idm4696-bb"><span class="identifier">deallocate</span></a><span class="special">(</span><span class="identifier">pointer</span><span class="special">,</span> <span class="identifier">size_type</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span>
  <span class="identifier">size_type</span> <a class="link" href="allocator.html#idm4704-bb"><span class="identifier">max_size</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span> <span class="keyword">noexcept</span><span class="special">;</span>
  <span class="identifier">pointer</span> <a class="link" href="allocator.html#idm4708-bb"><span class="identifier">allocation_command</span></a><span class="special">(</span><span class="identifier">allocation_type</span><span class="special">,</span> <span class="identifier">size_type</span><span class="special">,</span> <span class="identifier">size_type</span> <span class="special">&amp;</span><span class="special">,</span> 
                             <span class="identifier">pointer</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
  <span class="identifier">size_type</span> <a class="link" href="allocator.html#idm4720-bb"><span class="identifier">size</span></a><span class="special">(</span><span class="identifier">pointer</span><span class="special">)</span> <span class="keyword">const</span> <span class="keyword">noexcept</span><span class="special">;</span>
  <span class="identifier">pointer</span> <a class="link" href="allocator.html#idm4726-bb"><span class="identifier">allocate_one</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>
  <span class="keyword">void</span> <a class="link" href="allocator.html#idm4731-bb"><span class="identifier">allocate_individual</span></a><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span><span class="special">,</span> <span class="identifier">multiallocation_chain</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
  <span class="keyword">void</span> <a class="link" href="allocator.html#idm4739-bb"><span class="identifier">deallocate_one</span></a><span class="special">(</span><span class="identifier">pointer</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span>
  <span class="keyword">void</span> <a class="link" href="allocator.html#idm4745-bb"><span class="identifier">deallocate_individual</span></a><span class="special">(</span><span class="identifier">multiallocation_chain</span> <span class="special">&amp;</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span>
  <span class="keyword">void</span> <a class="link" href="allocator.html#idm4751-bb"><span class="identifier">allocate_many</span></a><span class="special">(</span><span class="identifier">size_type</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span><span class="special">,</span> <span class="identifier">multiallocation_chain</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
  <span class="keyword">void</span> <a class="link" href="allocator.html#idm4761-bb"><span class="identifier">allocate_many</span></a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">size_type</span> <span class="special">*</span><span class="special">,</span> <span class="identifier">size_type</span><span class="special">,</span> <span class="identifier">multiallocation_chain</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
  <span class="keyword">void</span> <a class="link" href="allocator.html#idm4771-bb"><span class="identifier">deallocate_many</span></a><span class="special">(</span><span class="identifier">multiallocation_chain</span> <span class="special">&amp;</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span>

  <span class="comment">// <a class="link" href="allocator.html#idm4794-bb">friend functions</a></span>
  <span class="keyword">void</span> <a class="link" href="allocator.html#idm4795-bb"><span class="identifier">swap</span></a><span class="special">(</span><span class="identifier">self_t</span> <span class="special">&amp;</span><span class="special">,</span> <span class="identifier">self_t</span> <span class="special">&amp;</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span>
  <span class="keyword">bool</span> <a class="link" href="allocator.html#idm4803-bb"><span class="keyword">operator</span><span class="special">==</span></a><span class="special">(</span><span class="keyword">const</span> <a class="link" href="allocator.html" title="Class template allocator">allocator</a> <span class="special">&amp;</span><span class="special">,</span> <span class="keyword">const</span> <a class="link" href="allocator.html" title="Class template allocator">allocator</a> <span class="special">&amp;</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span>
  <span class="keyword">bool</span> <a class="link" href="allocator.html#idm4813-bb"><span class="keyword">operator</span><span class="special">!=</span></a><span class="special">(</span><span class="keyword">const</span> <a class="link" href="allocator.html" title="Class template allocator">allocator</a> <span class="special">&amp;</span><span class="special">,</span> <span class="keyword">const</span> <a class="link" href="allocator.html" title="Class template allocator">allocator</a> <span class="special">&amp;</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span>

  <span class="comment">// <a class="link" href="allocator.html#idm4823-bb">private member functions</a></span>
  <span class="identifier">pointer</span> <a class="link" href="allocator.html#idm4824-bb"><span class="identifier">priv_allocation_command</span></a><span class="special">(</span><span class="identifier">allocation_type</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span><span class="special">,</span> <span class="identifier">size_type</span> <span class="special">&amp;</span><span class="special">,</span> 
                                  <span class="identifier">pointer</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
<span class="special">}</span><span class="special">;</span></pre></div>
<div class="refsect1">
<a name="id-1.3.9.14.3.3.4"></a><h2>Description</h2>
<p>This class is an extended STL-compatible that offers advanced allocation mechanism (in-place expansion, shrinking, burst-allocation...)</p>
<p>This allocator is a wrapper around a modified DLmalloc. If Version is 1, the allocator is a STL conforming allocator. If Version is 2, the allocator offers advanced expand in place and burst allocation capabilities.</p>
<p>AllocationDisableMask works only if Version is 2 and it can be an inclusive OR of allocation types the user wants to disable. </p>
<div class="refsect2">
<a name="id-1.3.9.14.3.3.4.5"></a><h3>
<a name="boost.container.allocatorconstruct-copy-destruct"></a><code class="computeroutput">allocator</code> 
        public
       construct/copy/destruct</h3>
<div class="orderedlist"><ol class="orderedlist" type="1">
<li class="listitem">
<pre class="literallayout"><a name="idm4777-bb"></a><span class="identifier">allocator</span><span class="special">(</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span></pre>
<p>Default constructor Never throws </p>
</li>
<li class="listitem">
<pre class="literallayout"><a name="idm4780-bb"></a><span class="identifier">allocator</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="allocator.html" title="Class template allocator">allocator</a> <span class="special">&amp;</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span></pre>
<p>Constructor from other allocator. Never throws </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> T2<span class="special">&gt;</span> <a name="idm4786-bb"></a><span class="identifier">allocator</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="allocator.html" title="Class template allocator">allocator</a><span class="special">&lt;</span> <span class="identifier">T2</span> <span class="special">&gt;</span> <span class="special">&amp;</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span></pre>
<p>Constructor from related allocator. Never throws </p>
</li>
</ol></div>
</div>
<div class="refsect2">
<a name="id-1.3.9.14.3.3.4.6"></a><h3>
<a name="idm4685-bb"></a><code class="computeroutput">allocator</code> public member functions</h3>
<div class="orderedlist"><ol class="orderedlist" type="1">
<li class="listitem">
<pre class="literallayout"><span class="identifier">pointer</span> <a name="idm4686-bb"></a><span class="identifier">allocate</span><span class="special">(</span><span class="identifier">size_type</span> count<span class="special">,</span> <span class="keyword">const</span> <span class="keyword">void</span> <span class="special">*</span> hint <span class="special">=</span> <span class="number">0</span><span class="special">)</span><span class="special">;</span></pre>
<p>Allocates memory for an array of count elements. Throws <code class="computeroutput"><a class="link" href="bad_alloc.html" title="Class bad_alloc">bad_alloc</a></code> if there is no enough memory If Version is 2, this allocated memory can only be deallocated with deallocate() or (for Version == 2) deallocate_many() </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">void</span> <a name="idm4696-bb"></a><span class="identifier">deallocate</span><span class="special">(</span><span class="identifier">pointer</span> ptr<span class="special">,</span> <span class="identifier">size_type</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span></pre>
<p>Deallocates previously allocated memory. Never throws </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="identifier">size_type</span> <a name="idm4704-bb"></a><span class="identifier">max_size</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span> <span class="keyword">noexcept</span><span class="special">;</span></pre>
<p>Returns the maximum number of elements that could be allocated. Never throws </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="identifier">pointer</span> <a name="idm4708-bb"></a><span class="identifier">allocation_command</span><span class="special">(</span><span class="identifier">allocation_type</span> command<span class="special">,</span> <span class="identifier">size_type</span> limit_size<span class="special">,</span> 
                           <span class="identifier">size_type</span> <span class="special">&amp;</span> prefer_in_recvd_out_size<span class="special">,</span> 
                           <span class="identifier">pointer</span> <span class="special">&amp;</span> reuse<span class="special">)</span><span class="special">;</span></pre>
<p>An advanced function that offers in-place expansion shrink to fit and new allocation capabilities. Memory allocated with this function can only be deallocated with deallocate() or deallocate_many(). This function is available only with Version == 2 </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="identifier">size_type</span> <a name="idm4720-bb"></a><span class="identifier">size</span><span class="special">(</span><span class="identifier">pointer</span> p<span class="special">)</span> <span class="keyword">const</span> <span class="keyword">noexcept</span><span class="special">;</span></pre>
<p>Returns maximum the number of objects the previously allocated memory pointed by p can hold. Memory must not have been allocated with allocate_one or allocate_individual. This function is available only with Version == 2 </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="identifier">pointer</span> <a name="idm4726-bb"></a><span class="identifier">allocate_one</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre>
<p>Allocates just one object. Memory allocated with this function must be deallocated only with deallocate_one(). Throws <code class="computeroutput"><a class="link" href="bad_alloc.html" title="Class bad_alloc">bad_alloc</a></code> if there is no enough memory This function is available only with Version == 2 </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">void</span> <a name="idm4731-bb"></a><span class="identifier">allocate_individual</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> num_elements<span class="special">,</span> 
                         <span class="identifier">multiallocation_chain</span> <span class="special">&amp;</span> chain<span class="special">)</span><span class="special">;</span></pre>
<p>Allocates many elements of size == 1. Elements must be individually deallocated with deallocate_one() This function is available only with Version == 2 </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">void</span> <a name="idm4739-bb"></a><span class="identifier">deallocate_one</span><span class="special">(</span><span class="identifier">pointer</span> p<span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span></pre>
<p>Deallocates memory previously allocated with allocate_one(). You should never use deallocate_one to deallocate memory allocated with other functions different from allocate_one() or allocate_individual. </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">void</span> <a name="idm4745-bb"></a><span class="identifier">deallocate_individual</span><span class="special">(</span><span class="identifier">multiallocation_chain</span> <span class="special">&amp;</span> chain<span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span></pre>
<p>Deallocates memory allocated with allocate_one() or allocate_individual(). This function is available only with Version == 2 </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">void</span> <a name="idm4751-bb"></a><span class="identifier">allocate_many</span><span class="special">(</span><span class="identifier">size_type</span> elem_size<span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> n_elements<span class="special">,</span> 
                   <span class="identifier">multiallocation_chain</span> <span class="special">&amp;</span> chain<span class="special">)</span><span class="special">;</span></pre>
<p>Allocates many elements of size elem_size. Elements must be individually deallocated with deallocate() This function is available only with Version == 2 </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">void</span> <a name="idm4761-bb"></a><span class="identifier">allocate_many</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">size_type</span> <span class="special">*</span> elem_sizes<span class="special">,</span> <span class="identifier">size_type</span> n_elements<span class="special">,</span> 
                   <span class="identifier">multiallocation_chain</span> <span class="special">&amp;</span> chain<span class="special">)</span><span class="special">;</span></pre>
<p>Allocates n_elements elements, each one of size elem_sizes[i] Elements must be individually deallocated with deallocate() This function is available only with Version == 2 </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">void</span> <a name="idm4771-bb"></a><span class="identifier">deallocate_many</span><span class="special">(</span><span class="identifier">multiallocation_chain</span> <span class="special">&amp;</span> chain<span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span></pre>
<p>Deallocates several elements allocated by allocate_many(), allocate(), or allocation_command(). This function is available only with Version == 2 </p>
</li>
</ol></div>
</div>
<div class="refsect2">
<a name="id-1.3.9.14.3.3.4.7"></a><h3>
<a name="idm4794-bb"></a><code class="computeroutput">allocator</code> friend functions</h3>
<div class="orderedlist"><ol class="orderedlist" type="1">
<li class="listitem">
<pre class="literallayout"><span class="keyword">void</span> <a name="idm4795-bb"></a><span class="identifier">swap</span><span class="special">(</span><span class="identifier">self_t</span> <span class="special">&amp;</span><span class="special">,</span> <span class="identifier">self_t</span> <span class="special">&amp;</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span></pre>
<p>Swaps two allocators, does nothing because this allocator is stateless </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">bool</span> <a name="idm4803-bb"></a><span class="keyword">operator</span><span class="special">==</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="allocator.html" title="Class template allocator">allocator</a> <span class="special">&amp;</span><span class="special">,</span> <span class="keyword">const</span> <a class="link" href="allocator.html" title="Class template allocator">allocator</a> <span class="special">&amp;</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span></pre>
<p>An allocator always compares to true, as memory allocated with one instance can be deallocated by another instance </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">bool</span> <a name="idm4813-bb"></a><span class="keyword">operator</span><span class="special">!=</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="allocator.html" title="Class template allocator">allocator</a> <span class="special">&amp;</span><span class="special">,</span> <span class="keyword">const</span> <a class="link" href="allocator.html" title="Class template allocator">allocator</a> <span class="special">&amp;</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span></pre>
<p>An allocator always compares to false, as memory allocated with one instance can be deallocated by another instance </p>
</li>
</ol></div>
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<div class="refsect2">
<a name="id-1.3.9.14.3.3.4.8"></a><h3>
<a name="idm4823-bb"></a><code class="computeroutput">allocator</code> private member functions</h3>
<div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem"><pre class="literallayout"><span class="identifier">pointer</span> <a name="idm4824-bb"></a><span class="identifier">priv_allocation_command</span><span class="special">(</span><span class="identifier">allocation_type</span> command<span class="special">,</span> 
                                <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> limit_size<span class="special">,</span> 
                                <span class="identifier">size_type</span> <span class="special">&amp;</span> prefer_in_recvd_out_size<span class="special">,</span> 
                                <span class="identifier">pointer</span> <span class="special">&amp;</span> reuse_ptr<span class="special">)</span><span class="special">;</span></pre></li></ol></div>
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